James asked this question in
Most of this question is answered by the rules, but I did some vassal graphics just to show how to do it for anyone who hasn't figured it out. The notional is a squad of 10 purifiers in a dozer rhino in conjunction with a GM. Purifiers are fearless, and will tend to be toting a hammer 2 psycannons and 2 incinerators ... this makes them a better unit for the task of first turn disruption if you're going to try it than most ... but, for the record, I think the times you should first turn charge like this are EXTREMELY RARE. Your opponent almost always has to do something stupid with the way he deploys, b/c you can only reach about 4" into his deployment zone (in pitched battle) ... this is nice and all, but not perfect, and you're still shoving a unit (and possibly 2 independent characters) forward into your opponent's army ... so you'd better get a lot back for doing it, as they're presumably going to take a beating.
BUT, anyway ... a unit with the Scout USR confers it upon its transport, per the Scouts rule in the BRB USR section. They also confer the ability to Outflank upon it, per the Outflanking rules in the BRB playing a battle section. So that covers that.
While the Rhino counts as moving in the pre-game, and on turn 1 if going 2nd (For hitting it in CC, etc), you count as stationary once your turn starts, so you can disembark from the rhino, move 6", and assault. You can always assault the turn you disembark if you disembark BEFORE the vehicle moves (or pivots). So, since you do your move with the Scout, you are good to go for assaulting.
Here's a pictorial of how to go about it "best" ... I find that opponent's most often will deploy forward foolishly with a deathstar that's not transported, something they want to get across the table and threaten you with, i.e. Nob Bikers (and don't worry, I'm not saying Nob Bikers are a pain in the ass to deal with at all here). Click to expand the size of each photo and see the writing in it:
The one funny thing worth mentioning is that the armies you most want to do this to are the ones who are most harmed by the actions required to avoid it. A foot horde ork army does not want to jam all of its guys 5" back into its deployment zone ... nob bikers and thunderwolves don't want to start further back (though the TWC care less due to the nature of the army that usually surrounds them, and their role in it, plus their larger charge range). Yadda yadda.
2nd Edit - You probably can't do the Coteaz force weapon activation and have it affect the unit; up for debate, but I think that part is a little off.